Cooling plate for a shaft furnace

ABSTRACT

A cooling plate for shaft furnaces, in particular, for blast furnaces, provided with a refractory lining, comprising cooling channels loadable with a cooling medium, wherein at least the front side facing the interior of the furnace is comprised of an ingot, produced preferably of copper or a low-alloy copper alloy and provided with grooves for receiving refractory material, is to be further developed such that it can be produced with a minimal material expenditure and a minimal manufacturing expenditure and can be easily mounted, and that with it a higher cooling capacity with reduced cooling medium throughput can be realized, wherein the own heat uptake is limited such that a significantly longer service life can be obtained. For this purpose it is suggested that two through-shaped rolled sections with their domed areas facing outwardly, respectively, are welded together and that bores for receiving the ends of pipe connector pieces are introduced into the backside supplemental section and the ends welded thereto, and that the free ends of the rolled sections are closed off by caps.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The invention relates to cooling plates (so-called staves) for shaftfurnaces, in particular, blast furnaces, provided with a refractorylining, comprising cooling channels loadable with a cooling medium,wherein at least the front side facing the interior of the furnace iscomprised of an ingot, produced preferably of copper or a low-alloycopper alloy and provided with grooves for receiving refractorymaterial.

2. Description of the Related Art

It is known to provide such cooling plates with a water cooling systemand to produce them of copper or a low-alloy copper alloy in order toprovide a minimal resistance to the heat to be dissipated.

In the prior German patent 29 07 511 the cooling channels are providedin a forged or rolled ingot as vertically extending blind bores whichare introduced by mechanical gun drilling. Such cooling plates must havea relatively great thickness in order for the cooling channels to havestill a sufficient wall thickness to withstand the operating pressure ofthe cooling medium. Copper plates of the thickness required for this areexpensive as a result of the high copper prices. The blind bores havefor a circular cross-section only the smallest possible inner surfacearea. Accordingly, for heat exchange with the cooling medium only littlesurface area is available, and only a moderate heat dissipation isachieved. This results in high thermal stress of the cooling plate, andthis negatively affects its service life.

SUMMARY OF THE INVENTION

The invention has the object to configure cooling plates of theaforementioned kind such that they can be produced with a reducedmaterial expenditure and a reduced manufacturing expenditure and can bemounted more easily in comparison to those known in the art and thatwith them higher cooling capacities with reduced cooling mediumthroughput can be realized wherein the own heat uptake is limited suchthat a significantly longer service life can be obtained.

As a solution to this object it is provided to produce the front part ofthe cooling plate trough-shaped in the central area as a domed rolledpart of relatively minimal thickness so that a considerable amount ofcopper material can be saved and to supplement the domed area by asecond, also outwardly domed rolled part to a cooling channel with across-section deviating from a circular shape and to thus provide ahigher cooling output. In addition to the advantage of a reduced copperconsumption, this provides the benefit of a more intensive coolingaction which, as desired, increases the service life.

Advantageous and expedient further developments of the subject matter ofthe invention are characterized in the dependant claims.

BRIEF DESCRIPTION OF THE DRAWINGS

The invention will be explained with the aid of the description of oneembodiment in connection with the drawings illustrating it. It is shownin:

FIG. 1 a central cross-section of the cooling plate;

FIG. 2 a cross-section of the cooling plate extending through the areaof the pipe connecting pieces;

FIG. 3 a twice interrupted longitudinal section of a cooling platemounted on a shaft furnace wall; and

FIG. 4 a view of the cooling plate from the rear.

In FIG. 1 a cross-section of the cooling plate, positioned at the centerof its length, is illustrated which shows a shield 1 which faces theinterior of the furnace and is rolled of copper or a copper alloy to bethrough-shaped. Transversely extending grooves 4 have been rolled intoits free surface which, at the end of the assembly, facilitate theapplication of refractory ramming or spraying material which arebeneficial for the later adhesion of the burden. In order to provide anefficient cooling channel 2, a supplemental section 3 is connected bywelding seams 13 to the shield 1. This supplemental section is alsorolled to be trough-shaped; however, across substantial portions of itslength it also has a stay 5, which extends perpendicularly from itscenter which and increases, on the one hand, the stability of the entirecooling plate and, on the other hand, facilitates its assembly.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

For assembly, a holder 8 is fastened to the inner wall 9 of the shaftfurnace, in the embodiment by welding, which holder is provided withbores 6. For effecting the assembly, it is sufficient to introduce thestay 5 into the holder 8 and to introduce a bore 6′ into the stay 5 fromthe side which bore is aligned with the bore 6 in the holder 8. Theactual connection is then realized by inserting and securing the bolt 7in the bores 6, 6′. Subsequently, the cooling plate can be back-filledwith a back-filling material 10 and subsequently, not illustrated inFIG. 1, the surface of the shield 1 of the cooling plate can be coveredwith a refractory ramming or spraying material.

FIG. 2 shows also a cross-section of a cooling plate but in its endarea. The shield 1 as well as the supplemental section 3 are illustratedwhich are fixedly and tightly connected by welding seams 13. Into a boreprovided in the supplemental section 3 one end of a pipe connector piece12 is inserted and connected with the supplemental section fixedly andtightly by a welding seam 14. A corresponding longitudinal section whichshows, in particular, both ends with caps 11 and pipe connector pieces12 is shown in FIG. 3.

In practice, the cooling plate is not used individually; it is providedas a module which is combined to larger cooling surfaces. Mounting ofthe cooling elements is carried out such that the front parts of thecooling plate, positioned laterally to the cooling channel andrepresenting only one element of the cooling surface, overlap withcorresponding parts of the neighboring cooling plate. In this way, inconical sections of a blast furnace armor, for example, the belly of theshaft furnace, the shaft or the like, it is possible to provide acompensation of different diameters or peripheries of the armor withoutthe width dimensions of the cooling plate having to be adjusted to thecone shape.

The welding of the shield 1 with the supplemental section 3 to form thecooling plate or the modular cooling element is carried out preferablycontinuously by means of a corresponding welding robot so that auniform, flawless, and liquid-tight configuration of the welding seam isensured. While for reasons of thermal conduction the shield 1 ismanufactured of copper or a copper-rich alloy, the supplemental section3 can be produced of less expensive materials which possibly have theadvantage of higher strength. It is only important that the shield 1 andthe supplemental section 3 can be welded well and easily.

List of Reference Numerals

1 shield

2 cooling channel

3 supplemental section

4 groove

5 stay

6 bore

7 bolt

8 holder

9 inner wall

10 back-filling material

11 cap

12 pipe connector piece

13 welding seam

14 welding seam

What is claimed is:
 1. In a cooling plate for a shaft furnace providedwith a refractory lining, the cooling plate including first and secondrolled sections of copper or a low-alloy copper alloy, wherein the firstand second rolled sections are welded together so as to form a coolingchannel therebetween, wherein the cooling channel is closed at ends ofthe rolled sections by caps, and wherein at least the first rolledsection facing an interior of the furnace has grooves for receiving andsupporting refractory material, the improvement comprising the first andsecond rolled sections each having a single trough, wherein the troughsof the two rolled sections form the cooling channel extending in asingle direction, wherein the second rolled section facing away from thefurnace interior is narrower than the first rolled section, wherein thesecond rolled section is arranged between essentially straight borderareas of the first rolled section, and wherein the second rolled sectionhas bores with pipe connector pieces welded into the bores.
 2. Thecooling plate according to claim 1, wherein the second rolled sectioncomprises a stay projecting away from the first rolled section.
 3. Thecooling plate according to claim 2, wherein an inner wall of the shaftfurnace is connected to holders enclosing the stay, and wherein theholders and the stay have bores aligned with one another and penetratedby bolts.